Structural member for airplanes.



j. TALGE.

STRUCTURAL MEMBER FOR AIHPLANES.

APPLICATION FILED FEB. 25 |918.

Patented Aug. 27, 1918,

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JOHN H. rares, or INDIaN'AroLIs, INDIANA. f

STRUCTURAL MEMBER FOR AlRPLANES.

Application filed February 25, 1918.

To all whom t may concern.'

Be it known that I, JOHN H. TALcn, a citizen of the United States,residing at Indianapolis, in the county of Marion and State of Indiana,have invented a new and useful Structural Member for Airplanes, of whichthe following is a specification.

The object of my invention is to produce a very strong but lightstructural member, especially adapted for use in air planes, either aswing beams or wing struts.

The accompanying drawings illustrate my invention. Figure 1 is aperspective section of a structural member constructed in accordancewith my invention, and Fig. 2 a

` cross section of another form.

It is a well known fact that wood veneers may be built up into verystrong members, but such veneers cannot be successfully bent into formshaving a short radius, and while it has heretofore been proposed toprotect or stifen structural members by taking a core of wood andsurrounding the same by one or more layers of veneer, yet such memberscannot be satisfactorily produced in the small sizes necessary for airplane work.

In order to avoid the above-mentioned ditliculty and to obtain a memberof sutlicient rigidity without the need of a solid core, my structuralmember is so formed of veneers that the veneers are not subjected to ahigh degree of curvature. As shown in Fig. 1, the member comprises threelaminated members A, B and C, each comprising several layers, 1 and 2,layers 1 being preferably thicker than layers 2, and having the grainthereof ruiming lengthwise of the structural member, while the grain ofthe layers 2 runs transversely. The inner pair 1 and 2 of the members Aand B are projected enough beyond the ends of the outer layers to equalthe thickness of the inner layer 1 of member B, so that the parts A, Band C are interlocked, as clearly shown in the drawings. The exteriorfaces of the members A and C are arranged at an angle to each other, sothat the normally forwardgoing face of the structural member will be orapproximate stream lines and in order to obtain the highest efficiency,the member B will be backed by a filler D, which will Specification ofLetters Patent.

Patented Aug. 27, 1918.

Serial No. 218,989.

have a rear face approximating well-recognized stream lines.

It is also desirable that a small triangular filler E be placed in thepoint, or corner, between thc members AV and C and to which said memberswill be glued.

In order to obtain further stiffness, if desired, metal plates 10 and 11may be provided for pressure distributers of tension rods 12 extendedthrough the ,structural member. In the form shown in Fig. 1, tension rod12 will tend to develop an arch stiffness in the side members A and C.

For further security, kerfs may be formed across the joint between thetwo side members A and B and strips of veneer 13 filled into thesekerfs. By such an arrangement the filler E may be omitted under somecircumstances.

I claim as my invention:

l. A structural member for air planes composed of laminated side membersand a cross member, interlocked and having a long radius of curvature,and a tension member eX- tended through the cross member and through thejoint between the side members placing the side members under transversecompression.

2. A structural member for air planes composed of laminated side membersand a cross member interlocked, and a tension member extended throughthe cross member v and through the oint between the side members placingthe side members under transverse compression.

3. A structural member for airplanes, composed of laminated side membershaving a long radius of curvature joined along two edges with theirother edges materially separated, and a laminated cross memberconnecting and interlocked with said separated edges of the sidemembers, the laminations of said cross member lying at substantiallyright angles to the laminations of the side members.

4. A structural member for air planes composed of laminated side membersjoined along two edges with their other edges materially separated, anda laminated cross member connecting and interlocked with said separatededges of the side members,

the laminzrtions of seid cross member lying ing members being thinmaterials set in a, substantially at right angles to the 1aminakerfformed across the joint. lo tions of the side members. n witnesswhereof, I have hereunto set my 5. A `structurel member for airplaneshand at ndianapolis, Indiana, this twenty composed of lamin atedsidemembers, a lamisecond dey of February, A. D. one thousand Hated Crossmember interioeked with the nine hundred and eighteen. side members, andlooking members for the joint between the side members, said leek- JOHNH. TALGE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Eatents, Washington, ED. C.

